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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae0728b7f0dce53b75b2a25a0b6d1afc201d0c16b46da97929a92b1f14c8c54' 
  AND token = '3sCRikgu8P3hBRlEf9D7vH+hHen6woHoUTvy7b5Rf4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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