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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78ae58ec96604982a7e350b7e0b34646d6309a3083995f202f056b78aa24392b' 
  AND token = 'Dw4GK62VY2EZHCXozKCIp7FVuMyZg7Nn5QPCzWuuhTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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