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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27df1361f68b2a7bb76d43cb014b071a3a48cb5586e3b7d92e055775f10d03b8' 
  AND token = 'GNwGvIJdA7J41euAHggxGw+lyTpyrTYy2rizYDtFfms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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