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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6985d91c67eb4ca23ac94cce0887c1b7226248d44b401755add81cff822e0773' 
  AND token = '1S/pto8o69ugQ7DtH+T1pEYklaf8DiCbJl5dYTGNAC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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