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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8513c5a47bade2563ea03e75e168bd8ce335538ddcbf208dcfa5efcebaa42304' 
  AND token = 'l2z8UJuM3CVrEW5gFE1YHOLw1SjemrDW437m5PUAFrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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