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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41285d2d80e9d2c144560ec86868ae6015f86b3a8d766f62711eb8cf80b4dfdd' 
  AND token = 'Zi8p00H3yOgVwcTkshGtMkkn20eZTeV+hDGsxWvETg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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