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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf1fb52fd57ce38c290269802fbfb35aa2785fa2a41ef9e262af4fe3cf0d534' 
  AND token = 'ljuaD4qpG3//Ic8FpZYXV8XdWfAEVfnFyps2Iq/qj2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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