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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c26d53d507f93b64ec73de199864ffa5375aa378339ff5ddc658089e3cddc7e9' 
  AND token = 'HZ3QlBPTcnan3xRsv1EEuDQxLo1h8fFxap55asKzT4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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