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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2edc9db6409508f55f0bfe15424c9b4ebc17a595648a7bd7e57a27cf59d7455f' 
  AND token = '0XOzSpbbOC1cJxfP697oyp1THmxbmJF8AqdmJKoJZ8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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