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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fddc46af86d705ca5b85f080c7b8b1524fc243d918cf86564a862b78a84c00a6' 
  AND token = 'sRtzylR6Yw9u9Ck66Ve7I77U6juciW5NA1cfhw2tyxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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