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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad31f7626518fd02caa98c8da594ded9816305f7953676a8e4e04cd0f56368d' 
  AND token = 'SMj5QBcFII6swJx5/ABeUCulPNXGJ0AwSp7m82WgyGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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