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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810dab77374ae4db26ae0815a65cc4e5c214b8ce14188b7440a94a269de0aa23' 
  AND token = 'Cyk+OR1hRx3tz1ohZVm8APPJ93DJ6CXlHIBKbGPGxLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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