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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16d4a0107812e1f526d9e217facb76bf6567329a285a85c9cbafb7bc4da0b8fd' 
  AND token = 'fHu8xcwMKhnFCIPUxvr4CP9dXX8wpzHG6oc85ztphA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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