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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff219a1797b56cb3c8d7e032ffdcb5c6c3887d1ee672926f7ac33aaa0494d62e' 
  AND token = 'dZ51nAxlFRCzn6dbGD1+OKLnQa5Nrt2jGpLavBcY4wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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