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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215ffe08a69137200d364a68d859f7cb88ef0dcafeceb627787f0d2659ac6c37' 
  AND token = 'R5E/HIZ0N0+KsROxPxBAxUHX2ec1rYikTdi5cTDVd9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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