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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55295cd2a2d08c82fbb6c6fa92bb645108d454a1d7589ecc5078bbbd5b686c09' 
  AND token = 'KKSlUr6PadOtbQPYgkCmgSVWkXtfHWZ8aKFx2/Pp6MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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