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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b55d0670b3e15c0d15585528aa280d3e04ad148e07ed93703a10fb706a23e9' 
  AND token = 'VQcLaslo8mlBbL3qk4e5IQlXpHTCR5rA+ktaT5umOuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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