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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aefd2f520622a766b1d12b83425061c8018be755c896d78f44f31f9f58f2cbe0' 
  AND token = 'K7haf3f16g/Z109c3x9S99zmqyEumBETW7u/BdRkUUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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