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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ea854fa2f1879296f93853ff575628128e62fb2feb0948eaf9999a36686005' 
  AND token = 'Tw6vOsllzhoi9jmrcjlBt+VnCOF/UJtyM3CdPx2650c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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