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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5128bf40d1ddcd0fa95e552e01d0a09219ad1709d5f39981e9ddd1d987579897' 
  AND token = 'bl7STBSt3JtxdKIsyyqS0sDeYH0by/bfdtUKDMTIcyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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