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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c928a4e1ce3113b179da94c85deb8be91a625c7b912733918355f2848d5ab63' 
  AND token = '0B2iD6JUrZ6v8bfs8mtXCaJQDx3QlAxWRXk//A7AiyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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