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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1477cb3538da1fa727fbfcc4965a07bf8094d35d78b864c30e3019d5305a1710' 
  AND token = 'YGVQ2QxJ4nLMMrEcTWq6efC8midS39x7aQjlQOE6V20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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