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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee796c223123514a6933aa262356ad033dd017b757c63b61d242e269117e7fa' 
  AND token = 'AzXuf4UG6P0jl1Tncm6t6Lo547llLKsv1GyJT0UTNYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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