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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '217c2d3c042058cd2fc036f31e886d26076f6d7e466f3a0d94e94e38d6c86e74' 
  AND token = '6PhviJk5N0GpBuaGvIHBgi936ck/F9rtbyh+/ItZOOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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