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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afde8e7edfdc5bbc7ef7deaffe3d9aae680abf34b8e0ab6b627b46f59d49f81d' 
  AND token = 'NZsqv5Qqbv45MyEKgTCcFP0Djl/nQsZicn/2i0SyqXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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