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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e038dbb23a20221e4ab4551459fc301ac6636d0837ccbe2916c98866cd392e3c' 
  AND token = '3ymOuPTUXjhSCxsV5aMjyvCGvweby/vRLHM+J6hb8rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}