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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c8a9c704d28530d0d1e88d377a6d245e4fe55d7260d6fcd0856af5653a726a0' 
  AND token = '6Ash92BoO5LVaw0Kd5H3EtGYeHwWb4wMjj8PJtA2zrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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