SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e206310ecdc7f1abc4dfb5b5cd7cb9d58694098724009c44f660363777cdd5' 
  AND token = 'JLqkGTmT6AP2RNkCdbMGlQ3V5pLaE7wsD77p+dFEDRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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