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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4a6c6110e22cb0141efad636a31e1f8fd11bccaa307e56269eed4de8c5d08e' 
  AND token = 'W+t1u+J1EeYiQKmVF/Em8HGBurwLUMIVjBmpJqjYvaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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