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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30721aa2fbf49eb24600b982d34a81c3c3fe9b5195155fd2d1657a11043381b9' 
  AND token = '62tCvAySG1FGOciw5ztvvshkigfS1S6x6jROFW4qWNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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