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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc81c8517a4e38bea6dc2265c8d70fd46fe7fa7613b54206274c8cfab9047fa3' 
  AND token = 'de83ARY39d7xKBTLapgxvhx17G1F08NEy8J9PfHhUUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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