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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4824a6c4cb2091f1ca0eb5220096c633cd965c33031ab2863e0a0f15eee209a' 
  AND token = '17g4AsUZ3lirC7B+5vWyoOsTEYavoF2LkGAFB2m3wHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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