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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '548c9b6d2cfdcc2943e54713df0cddb43b5edc7b8364eddc8110f5a16410914f' 
  AND token = 'j2ylopxkG0GWrk8LlPJFhkte5Jng6/63aj1UJ7Uq9bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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