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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9705ad7615e63656972cf822045d6d9f820665ce7218a5732f23f369d8f074ee' 
  AND token = '5eogTH6ozLuMvZf7ko6WfJgWQlPJOi0mHij/SoNXoHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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