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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '345001ef6a7a9020002e25030c3a1f2218b84cea53d47310bdacc517e8507314' 
  AND token = 'xhiB4GtkVsSZCGR58dhDCBS/gWJF9TWQTk9uKx+izcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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