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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd313896a7deaf52f70a25b235137fd53aa2f4814b01585193913df5de3c565bc' 
  AND token = 'UYHNyMvyX9xwx/29nvs/HoWG7rG+GIutWhtBpM4M59c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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