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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc49bbb2b237ad702675e8cd170a8b9aea958275654bc58721054c7bbfcd0bbc' 
  AND token = 'FF4rKiPkFGtEuPr5svvfc9YSyx9m1Nq9usGpo0aYJis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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