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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d3c08b452145354fc83838b0a57432d7a34aac092030d07e8ea4403bb4df4c6' 
  AND token = 'LNTOqOhME00QznSIJYXNFr1bEljO66PWsnXBw8jhn40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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