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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b1c29245c4335a911e9fa111a9d7fc7ae3c42cd4afe356bcebe0a6e1fbdf1c0' 
  AND token = 'Jim2K/m0A/BbZzrj7wVYK/qnborKATO6QdIpTA69pOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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