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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '220ba7c7dbe6fd90ad62ee94aefb3fd7a6c0847b7758000d7a988cc0d53a6be4' 
  AND token = 'MS1a7cHY+XUcZDtRdOdjP2INbWMey+I2GmWwpxz6f2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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