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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ae9f216cb72c13aaf8736236fe0ed871d1235cb22a7e0c404c8669e332f73c' 
  AND token = 'efidosmnw5DXQkvxV0iYVhSgPbzclRVzNvscMks2ys0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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