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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1caf0692dea569f181e097365ed391c4fffef435d9476eaff8730999c73f0eb7' 
  AND token = 'F6N6mf9G61wCq7DcNkEsYWavqGIM8WfF26I7Pi8woBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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