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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2f6f34bd3a875fa48fa333bf9a792d16c2a0b56d2e3b828aa9942961fb64c5' 
  AND token = 'Px+f98OGRv5BP8BXrthRzojTB1tW5kvfyZGIUGZ3/ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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