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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70d65c0e603e09f3b40f52de13540263e25a50404b30d871db38883d9e88da6' 
  AND token = 'NWSrfpeLAvdJ78euRE9S7sFB/vMBzw5L8XBbyr7pG+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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