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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9be3c0dbc7b491592eff703673c3c0e293b6723796adc677aee3cbf32fea97d' 
  AND token = 'I9b9KW+/sw/D1amt2l08IPnzuO7wxvDxFDQJw8ifql4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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