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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc400294059101c50888a44cb03df783c2d69de8ae11a443a3dc8925960fb58e' 
  AND token = '6dxXKMcoamFp50LZKJg4f6AEXCLgumvyMD9iivH5nsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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