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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29608780ee2db048c087359cec5b84ccef8802d8d4603332bca734a12a5bc6a2' 
  AND token = 'NL7kbTaX7nA9U6pqMgoichaefpzwkBLCpacVx1MCSv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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