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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d23b3e906573ba96eac8371c81e6045ca20b2f93294b4283cdba169fb1df96e' 
  AND token = 'rx8kJe3sPsD9czds60Xk65cDffUYmEtPm6ElUn8aSek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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