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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '396190209802e4bc7475c307a03ee81bfb941d0199f928a8f93e1270b64446d9' 
  AND token = 'umvDi/6HLKZ2T+I8j+tp490a/F4ABAPROV473QV9Ud8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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