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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdceb5035a28ed994f43effb324897e0437522e3526f8b55117bea4b8b9300d3' 
  AND token = 'tZ4ElXM7bnU4R9taRQNwZPbt5XyjvMStZ0p9ItIa+6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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