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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe15bb0ff2dd99d43a0a757faa1d31cd340893bb07b569c0cd132cf09416b1f9' 
  AND token = 's2Bm/9PFlzfS9EamaX5z7wuDiagnUbiQm713gszVe7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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