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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9792f1a5bac37b06954810949a5fed80d2bf93e7c56f0192a7fd05fbd9248e95' 
  AND token = 'cyaITOi9mwlgTqz2ARHg9e5osQ6Ia+jwPY1vTz77Miw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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