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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631ea00233b34a65e1f2b2d4835be7ea109d58c059d057e84883c652c899236e' 
  AND token = 'SKwaG7J3uLg079nC9vDGRMdgLsyJxBnwCMjT0n833B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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