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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce6ad2cefc21c19532f966967aca5c8fe1ae5bd66d2950fd28dc060dd9fb64d' 
  AND token = 'WFAjr5rNs43henCkflI34kDkaMQyYmO4WiKopsAx6rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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