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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc1ae0157badb4156f8f75e5327c03666016c02c19fa2e9fe49423e6a96e0a4' 
  AND token = 'SlT6md8MiEPLPLF29gFcMI74H6Lu10om9gi+QutmPD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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