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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36fc284cd7fe9a62ee5af6b5dea71fbfe6db4ead0841757f5ecf87a6f65839a1' 
  AND token = '9aWxjc1RqQLsk0Su0b8NwvJaKNrfFVXT0ADPKPuYq5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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