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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '296c8b8e70887b8db30054d1cc7c9f7986e643ec6236aca111c2e226dffafd5f' 
  AND token = 'lHKyUU7jV7w5siCm2uPXifhMGw01MytuoePsfyn0RpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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