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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a700011f5194d68ebd7f80ade679fe2c7dcd2bb1bbfad6727fd79830dc8548d3' 
  AND token = 'Ce1qpa0QqUJulLf9sVQIc4TU9OkNy9/tfXWXm0Vw7LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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