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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf1b964dd1ab459a668929077700954d8be42ed21c865afb9faeee50b3ec69e' 
  AND token = '5dLIfCPTZveYGme1M/hMhGC6JLhhQ6O8V7U8ZHKN/Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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