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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58d75ab562473ec9025457ccb1b6a440f44d153ae5bc3d950ec6e6f5d8ea89e' 
  AND token = '5T9WtQBoGTL5a6QkkTnDjYK/fbSbrHdgwsdtwrc7ppk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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