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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee19f7770af89c2cd093d2e9137ab957608f295e72e1ec1b7e68adb432fc758' 
  AND token = 'jyFqNfsuYjb3JLiT+UwEFNvvEXgFwGjfWEoevOONbyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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