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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6282b11ddf159464ed1712c642d9bb61fb10cf57ffd5ab83a95a89b69fde1ec' 
  AND token = '4zRU/ab7L/iki3y7ajIWqlHDLZ+BudvniWt2CU/xCSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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