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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cf30cc906760ca9a974a509a9d36308c6481c5e991b16d6660a204b03b1fe50' 
  AND token = 'AcfWBB0ep/9/opBneZnmyFkMmQCg7l0GAXF5HtS/HpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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