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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd137c522e65aa34d54c1a32b1e73ea07fb6ff6c3c41035bc47236871c6cf46c' 
  AND token = 'FA71SDOz6YRpzrsTcMSE8JU8rjCR0wf2DpRfLfHi0MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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