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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5ff0f918f3a6f890ad3ae06469e6a5387c5fe7650a384594b0b959ac2a8caf' 
  AND token = '16ssBmcDuJKI6cw/4iUtH+uDq0Cu7ZJlsQCJOVJcdPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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