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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c8ecf41b95d851a6cdc57d175fd1a13b6c3ae5a285d6a29a54880a8a7ebee5' 
  AND token = 'nyzTT7pddmqFAq1mnLOvpifj+Tu/+TW2G8e/WOHNnqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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