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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802a6a6902af0ca2d9c40d2340149b4e9fafdadfba52ba50254c192dc6805bcb' 
  AND token = 'MlJN8vy2vl7YVtO4pTBQIihNaoB7+LvMe9YGG13Ptwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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