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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1286eaacb4987a93a601bc6695dedd89c0f09904fb74a947efa4f4d2355735e4' 
  AND token = 'k5bAi4qZS+4KpeeHY56ipBloCPTBCd6UjUWmRLaQ6/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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